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fix(dma): apply proper masks to dma i/o

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-10-29 04:53:21 -03:00
parent c75682dbd4
commit f0dca29836
1 changed files with 38 additions and 20 deletions
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58
src/core/bus/dma.zig
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@ -24,35 +24,49 @@ pub fn read(comptime T: type, dma: *const DmaTuple, addr: u32) ?T {
return switch (T) {
u32 => switch (byte) {
0xB0, 0xB4 => null, // DMA0SAD, DMA0DAD,
0xB8 => @as(T, dma.*[0].cnt.raw) << 16, // DMA0CNT_L is write-only
0xB8 => @as(T, dma.*[0].dmacntH()) << 16, // DMA0CNT_L is write-only
0xBC, 0xC0 => null, // DMA1SAD, DMA1DAD
0xC4 => @as(T, dma.*[1].cnt.raw) << 16, // DMA1CNT_L is write-only
0xC4 => @as(T, dma.*[1].dmacntH()) << 16, // DMA1CNT_L is write-only
0xC8, 0xCC => null, // DMA2SAD, DMA2DAD
0xD0 => @as(T, dma.*[2].cnt.raw) << 16, // DMA2CNT_L is write-only
0xD0 => @as(T, dma.*[2].dmacntH()) << 16, // DMA2CNT_L is write-only
0xD4, 0xD8 => null, // DMA3SAD, DMA3DAD
0xDC => @as(T, dma.*[3].cnt.raw) << 16, // DMA3CNT_L is write-only
0xDC => @as(T, dma.*[3].dmacntH()) << 16, // DMA3CNT_L is write-only
else => util.io.read.err(T, log, "unaligned {} read from 0x{X:0>8}", .{ T, addr }),
},
u16 => switch (byte) {
0xB0...0xB8 => null, // DMA0SAD, DMA0DAD, DMA0CNT_L
0xBA => dma.*[0].cnt.raw,
0xBC...0xC4 => null, // DMA1SAD, DMA1DAD, DMA1CNT_L
0xC6 => dma.*[1].cnt.raw,
0xC8...0xD0 => null, // DMA2SAD, DMA2DAD, DMA2CNT_L
0xD2 => dma.*[2].cnt.raw,
0xD4...0xDC => null, // DMA3SAD, DMA3DAD, DMA3CNT_L
0xDE => dma.*[3].cnt.raw,
0xB0, 0xB2, 0xB4, 0xB6 => null, // DMA0SAD, DMA0DAD
0xB8 => 0x0000, // DMA0CNT_L, suite.gba expects 0x0000 instead of 0xDEAD
0xBA => dma.*[0].dmacntH(),
0xBC, 0xBE, 0xC0, 0xC2 => null, // DMA1SAD, DMA1DAD
0xC4 => 0x0000, // DMA1CNT_L
0xC6 => dma.*[1].dmacntH(),
0xC8, 0xCA, 0xCC, 0xCE => null, // DMA2SAD, DMA2DAD
0xD0 => 0x0000, // DMA2CNT_L
0xD2 => dma.*[2].dmacntH(),
0xD4, 0xD6, 0xD8, 0xDA => null, // DMA3SAD, DMA3DAD
0xDC => 0x0000, // DMA3CNT_L
0xDE => dma.*[3].dmacntH(),
else => util.io.read.err(T, log, "unaligned {} read from 0x{X:0>8}", .{ T, addr }),
},
u8 => switch (byte) {
0xB0...0xB9 => null, // DMA0SAD, DMA0DAD, DMA0CNT_L
0xBA, 0xBB => @truncate(T, dma.*[0].cnt.raw >> shift(byte)),
0xBC...0xC5 => null, // DMA1SAD, DMA1DAD, DMA1CNT_L
0xC6, 0xC7 => @truncate(T, dma.*[1].cnt.raw >> shift(byte)),
0xC8...0xD1 => null, // DMA2SAD, DMA2DAD, DMA2CNT_L
0xD2, 0xD3 => @truncate(T, dma.*[2].cnt.raw >> shift(byte)),
0xD4...0xDD => null, // DMA3SAD, DMA3DAD, DMA3CNT_L
0xDE, 0xDF => @truncate(T, dma.*[3].cnt.raw >> shift(byte)),
0xB0...0xB7 => null, // DMA0SAD, DMA0DAD
0xB8, 0xB9 => 0x00, // DMA0CNT_L
0xBA, 0xBB => @truncate(T, dma.*[0].dmacntH() >> shift(byte)),
0xBC...0xC3 => null, // DMA1SAD, DMA1DAD
0xC4, 0xC5 => 0x00, // DMA1CNT_L
0xC6, 0xC7 => @truncate(T, dma.*[1].dmacntH() >> shift(byte)),
0xC8...0xCF => null, // DMA2SAD, DMA2DAD
0xD0, 0xD1 => 0x00, // DMA2CNT_L
0xD2, 0xD3 => @truncate(T, dma.*[2].dmacntH() >> shift(byte)),
0xD4...0xDB => null, // DMA3SAD, DMA3DAD
0xDC, 0xDD => 0x00, // DMA3CNT_L
0xDE, 0xDF => @truncate(T, dma.*[3].dmacntH() >> shift(byte)),
else => util.io.read.err(T, log, "unexpected {} read from 0x{X:0>8}", .{ T, addr }),
},
else => @compileError("DMA: Unsupported read width"),
@ -177,6 +191,10 @@ fn DmaController(comptime id: u2) type {
self.word_count = @truncate(@TypeOf(self.word_count), halfword);
}
pub fn dmacntH(self: *const Self) u16 {
return self.cnt.raw & if (id == 3) 0xFFE0 else 0xF7E0;
}
pub fn setDmacntH(self: *Self, halfword: u16) void {
const new = DmaControl{ .raw = halfword };